David and Tom are good friends. They ______ each other for ten years.
A. knew B. know C. have known D. had known
—__________ were the boys?
—Oh， they played basketball on the playground.
A. When B. What C. Who D. Where
I think my new dress is ______ than the old one.
A. nice B. nicer C. nicest D. the nicest
We celebrate our national day ______ 1st October every year.
A. in B. at C. on D. for
Mike is my friend. I often help _____ with his Chinese.
A. him B. he C. his D. himself
书面表达
现在大多数教科书都只使用一次，这是一种极大的浪费。循环使用教科书可以减少树木砍伐，同时也可以保护环境。在教科书的循环使用过程中，同学们要爱惜书本，不乱涂画，保持书本的干净整洁。请你根据以上提示内容写一篇英语短文，谈谈你对循环使用教科书的看法。
注意：1，词数80—100；
2，请不要逐句翻译，可适当发挥；
3，文章的开头已给出，不计入总词数。
参考词汇：recycle 重复使用 benefit 有益于 damage 损坏
Recycling textbooks is a good way which will benefit both the society and students.___________________________________________________________________________________
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